Wolo (3360P-R Bright Star Emergency Warning Strobe Light - Red Lens, Permanent Mount Red lens Produces one powerful flash per second, 2.5 joules (200,000 candlepower) Engineered with innovative solid-state circuitry and superior electronic components that will provide years of dependable service in all weather conditions The electronics are encapsulated in rock hard epoxy to protect against vibration and moisture The replaceable lens is made of strong polycarbonate plastic with advanced optics, specifically designed to enhance the brightness of a strobe tube light